Review Two

Protons= Positive

Electrons= Negative

Neutrons= Neutral

Nucleus= CENTER of an atom. (Protons and neutrons located here). Where all the mass is

Electron Cloud= Orbiting around the nucleus. (Electrons located here). Massless area

18 Total Groups w/8 Major Groups (columns up and down)

7 Periods (rows left and right)

Metals are to the LEFT of the staircase

Non-Metals are to the RIGHT of the staircase

Atomic Number: Listed above the element on the Periodic Table (how they are arranced as well). Ex- Hydrogen's Atomic Number = 1

Atomic Mass: The unrounded number below the name of an element. Ex- Carbon= 12.01

Mass Number: The ROUNDED atomic mass. (Also equal to the number of protons + neutrons) Ex- Carbon = 12